In this verse, Jesus uses a metaphor to illustrate the concept of spiritual warfare and the power dynamics involved. The 'strong man' represents someone who relies on their own strength and defenses, symbolized by armor, to protect themselves and their possessions. However, when a stronger force comes along, it can easily overpower and strip away these defenses, leaving the person vulnerable. This serves as a reminder that human strength and security are ultimately limited and can be overcome.
The deeper spiritual lesson here is about the importance of relying on God's strength rather than our own. In the context of spiritual battles, believers are encouraged to trust in God's power, which is far greater than any human strength. This verse calls for humility and a recognition of our own limitations, urging us to seek divine protection and guidance. It emphasizes that true security comes from God, who is the ultimate source of strength and victory over any adversary.